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LAKE MARY, Fla. (FOX 35 ORLANDO) - A memorial is planned for Thursday night for the 17-year-old student who took her own life at Lake Mary High School.

The school was put on lockdown last week after a female student shot and killed herself in the school's auditorium. Seminole County Sheriff Dennis Lemma said that the student, who was a junior at the school, asked to leave class just before 8:00 a.m. Wednesday morning to use the restroom.

Moments later, the Sheriff's Office said that a teacher reported hearing a gunshot.

"The two deputy sheriff's that are assigned as school resource deputies responded immediately, in less than a minute, with a school nurse in an effort to render aid to the child, unsuccessfully," said Sheriff Lemma.

During their investigation, Sheriff Lemma said that the teen struggled with mental health. The girl had reportedly been hospitalized through the Baker Act twice--once in 2015 and again in December of 2018. She also had been seeing counselors for help, according to investigators.

Lake Mary Church is organizing the memorial at 5:30 p.m. inside the high school auditorium.